This special tool allows you to install and insert the axle shaft seal of your vehicle in its proper depth, distance and position by driving it in with a rubber mallet or hammer onto the wheel knuckle assembly. This is applicable for your 2005 F-250, 2007 F-250, 2009 F-350, 2012 F-350 and 2019 F-350. If you need to replace any parts on the steering and suspension components like u-joints, including ball joints then youre going to need to replace also the vacuum seal to avoid leakage using this vacuum seal tool for proper installation.